| Quercus polymorpha | |
| Author | Schltdl. & Cham. 1830 Linnaea 5: 78 |
| Synonyms | guatimalensis
A.DC 1864 pro parte petiolearis Benth. 1840 turbinata Liebm. 1854, nom. illeg. not Bl. 1825 Diagnosis here varians Mart. & Gal. 1843 germana var. lemmonii Trel. 1924 polymorpha f. angustifolia C.H.Muller 1936 |
| Local names | net-leaf white oak ; mexican white oak ; Monterrey white oak ; |
| Range | Mexico, on Atlantic slope (Chiapas, Hidalgo, Nuevo Leon, Oaxaca, Puebla, Queretaro, San Luis Potosi, Tamaulipas, Veracruz); Guatemala; SW Texas; 200-2450 m; |
| Growth habit | 10-20
m tall; |
| Leaves | 5-14
x 3-6 cm; sub-evergreen; coriaceous; elliptic or ovate; apex obtuse, rounded
or retuse, seldom acuminate, mucronate; base rounded or cordate; margin
thickened, slightly revolute, somewhat cartilaginous, entire or with 2-5
pairs of short, mucronate teeth; green or glaucous, slightly lustrous,
almost hairless above or with stellate hairs on midvein; paler, dull,
glaucous beneath, hairless or sometimes loosely fascicled pubescent, and
with rusty glandular hairs scattered, mainly along veins; 8-13 vein pairs,
impressed above and prominent beneath; tertiary veins conspicuous beneath;
epidermis glaucous, waxy, papillose; petiole slender, yellowish, 1.4-3
cm long, glabrescent; |
| Flowers | in March; staminate carkins 3-7 cm long, densely flowered, tomentose; pistillate flowers 1-2 on a pubescent peduncle less than 1 cm long; |
| Fruits |
acorn
1.5-1.8 cm long, 0.8-1.2 cm in diameter, oblong; singly or paired on
a 1-2 cm long peduncle located at the axil of the leaves; enclosed 1/2
by cup; cup velutinous, 1.2-1.5 cm in diameter, with strongly tuberculate
triangular scales; cotyledons free; maturing in 1 year from October
to December; |
|
Bark, twigs and |
bark
grey brown, scaly; twigs 2-3 mm wide, red brown, tomentose at first, becoming
glabrous, with numerous lenticels; buds red brown, ovoid, pointed, 3-7
mm long; |
| Hardiness zone, habitat |
hardy : zone 7 (hardly withstands -16° C); all types of soil; cultivated
in Spain, and in UK (at Kew); |
| Miscellaneous | --
A. Camus : n° 210; -- Sub-genus Quercus, Section Quercus, Series Polymorphae; -- Discovered in 1992 only in the US Territory; -- Possible confusion with Q. germana which has petioles 0.3-0.6 cm long, acorns 2.8-4 cm long on a peduncle located at the end of the twigs. |
| Subspecies and varieties |
--
Q.juergensenii Liebm.1854
Overs. Kongel. Danske Vidensk. Selsk. Forh. Medlemmers Arbeider 1854:
188 (A. Camus : n° 211) Diagnosis here from Mexico (Puebla), is a doubtful species, probably identical to Q.polymorpha, with petiole shorter and leaf base cuneate; |
| Pictures |
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